This bowling ball ships PRE-DRILLED. There are 5 sizes and the sizes that we drill are based on the weight of the ball. X-Small: 6lbs- Ages 8 and under, Small: 8lbs and 9lbs- Ages 8-11 and womens ring size from 8-11, Medium: 10lbs, 11lbs, and 12lbs, Ages 11-15 and Adult Ring size 10 or lower, Large: 13lbs and 14lbs, Mens ring size 10-12 or people with larger hands, X-Large: 15lbs and 16lbs, Mens ring size over 13 or people with extremely large hands. If you would like a different size drilled for the weight you selected, you must contact us via email as soon as your order is placed with your order number. Pre-Drilled bowling balls cannot be returned or exchanged. Ebonite has produced some of the best balls on the market at a value price for a long time. It’s hard to find a better ball for the price than a Game Breaker or even the One. The new Ebonite Fireball outperforms its price point and will be a great addition to any level of player’s bag. The Fireball has a modified lightbulb core shape and a skid-flip cover, GB10.7, with HK22. This is a great go-to piece on conditions with less volume for a competitive bowler, but newer bowlers will love its color, performance, and value PERFORMANCE: Mid COLOR: Red / Gold CORE: Fireball COVERSTOCK: HK22 - GB10.7 Pearl COVER TYPE: Pearl Reactive FINISH: 500, 1000, 1500 Siaair / Factory Compound WEIGHTS: 16-10 Pounds LANE CONDITION: Light to medium oil REACTION: Skid / Flip WARRANTY: Two years from purchase date Radius of Gyration(RG): 16lbs - 2.528; 15lbs - 2.519; 14lbs - 2.539 Differential(Diff): 16lbs - 0.034; 15lbs - 0.039; 14lbs - 0.038